Check the listing for details. 50 Pcs 12mm (1/2") Plastic Binding Combs 90 Sheet Capacity 21 Rings, White. Condition: New. Listed at 18.78 USD. These plastic binding comb spines are suitable for various office occasions and provide great convenience for file storage, file binding, paper collection, etc.It is a portable product for office and study.SpecificationInner diameter: 12mm (1/2 Inch)Length: 300mm/11.8 Inch;Number of binding pages: 90;Material: plastic;Color: White;Packing List: 50 Pcs Plastic Binding Comb SpinesAdvantageThe binding comb spines are made of long-lasting, strong plastic to ensure long-term productivity for all your binding projects, allowing you to easily bind papers and preserve them for a long time.InstructionThese binding comb spines are designed in 21 rings, making them suitable for any 21-hole rubber ring binding machine. Binding spirals provide a 360-degree page-turning rotation capability for easier reading.